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This is the type of thing we like to see. APR has posted their own graphs but they tend to do them in crank horsepower which is, well, pretty annoying. A customer took his car for before and after dyno pulls on a Mustang and went from 297 awhp to 361 awhp with tune only. Impressive? Yes. The car in question is a 2011 Audi S4 with a custom Milltek exhaust and the APR 93 octane tune.

Great looking car. And I think the power gains look great, but isn't the AFR extremely lean?

I'm not knowledgeable about Audis, although they seem like great cars. Perhaps, the engines are built to run very lean, although the stock AFR -- while probably very conservative from the factory -- does not seem that way.

Well, I would like to see a slightly better graph but yes it does appear to be a bit lean although it seems to be mostly at redline which could be somewhat of a spike. The thing is with DI you can get away with being a bit lean more than you can with port injection. So is it an aggressive tune? Certainly appears to be.

Well, I would like to see a slightly better graph but yes it does appear to be a bit lean although it seems to be mostly at redline which could be somewhat of a spike. The thing is with DI you can get away with being a bit lean more than you can with port injection. So is it an aggressive tune? Certainly appears to be.

Even with DI they are over 13.0:1 at WOT across the board post tuning. That is VERY aggressive for a PD blower or any kind of FI. Now imagine the car on the road with real world airflow and watch the A/Fs go .3 to .5 leaner.

FWIW, I would never market a tune that lean, not even close. Solid gains but too risky for me.